Like Neumanns says above. The only thing I can think of that would cause unusual settings is if you had the file worked on before, or worked on it in Lightroom and saved the edits to an XMP file that CS read, or you saved settings in ACR at some point as the default.
But, some ACR controls do have a default setting of above 0 (brightness, for some reason, has the value 50 as the default opening value, even though it seems it should be 0, since sliding it down to 0 really darkens things). Contrast has a default setting and blacks have a default setting that are above zero -- I think this is meant as an "automatic compensation" for your cameras dealiasing softness. Chroma/Color noise has a default setting to get rid of some base color noise, and three of the 4 sharpening sliders also have a bit of a default, again making an assumption of the dealiasing softness.